The version of the phone system is important because there has been a problem with the admin of the processor locking up, especially when connected to a Stratagy ES.

For systems with 3.XX software, it was supposed to be fixed with ver 3.10 MK050.If you have ver 4.XX on a neweer processor, you would need to update the software to the latest 5.20 to fix it.

In the mean time, if it is a lockup issue, cycling power to the phone system should fix it for now.